Add one-variable-per-declaration tslint rule

Multiple declarations per line makes it more difficult to read what
exactly is declared and generally makes code more verbose and less
likely to fill in types

src/InputHandler.ts

@@ -189,14 +189,12 @@ export class InputHandler implements IInputHandler {
    * Insert Ps (Blank) Character(s) (default = 1) (ICH).
    */
   public insertChars(params: number[]): void {
-    let param, row, j, ch;
-
-    param = params[0];
+    let param = params[0];
     if (param < 1) param = 1;
 
-    row = this._terminal.buffer.y + this._terminal.buffer.ybase;
-    j = this._terminal.buffer.x;
-    ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
+    const row = this._terminal.buffer.y + this._terminal.buffer.ybase;
+    let j = this._terminal.buffer.x;
+    const ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
 
     while (param-- && j < this._terminal.cols) {
       this._terminal.buffer.lines.get(row).splice(j++, 0, ch);
@@ -325,9 +323,8 @@ export class InputHandler implements IInputHandler {
    * Cursor Position [row;column] (default = [1,1]) (CUP).
    */
   public cursorPosition(params: number[]): void {
-    let row, col;
-
-    row = params[0] - 1;
+    let col: number;
+    let row: number = params[0] - 1;
 
     if (params.length >= 2) {
       col = params[1] - 1;
@@ -439,14 +436,13 @@ export class InputHandler implements IInputHandler {
    * Insert Ps Line(s) (default = 1) (IL).
    */
   public insertLines(params: number[]): void {
-    let param, row, j;
-
-    param = params[0];
+    let param: number = params[0];
     if (param < 1) {
       param = 1;
     }
-    row = this._terminal.buffer.y + this._terminal.buffer.ybase;
+    let row: number = this._terminal.buffer.y + this._terminal.buffer.ybase;
 
+    let j: number;
     j = this._terminal.rows - 1 - this._terminal.buffer.scrollBottom;
     j = this._terminal.rows - 1 + this._terminal.buffer.ybase - j + 1;
 
@@ -475,14 +471,13 @@ export class InputHandler implements IInputHandler {
    * Delete Ps Line(s) (default = 1) (DL).
    */
   public deleteLines(params: number[]): void {
-    let param, row, j;
-
-    param = params[0];
+    let param = params[0];
     if (param < 1) {
       param = 1;
     }
-    row = this._terminal.buffer.y + this._terminal.buffer.ybase;
+    const row: number = this._terminal.buffer.y + this._terminal.buffer.ybase;
 
+    let j: number;
     j = this._terminal.rows - 1 - this._terminal.buffer.scrollBottom;
     j = this._terminal.rows - 1 + this._terminal.buffer.ybase - j;
 
@@ -509,15 +504,13 @@ export class InputHandler implements IInputHandler {
    * Delete Ps Character(s) (default = 1) (DCH).
    */
   public deleteChars(params: number[]): void {
-    let param, row, ch;
-
-    param = params[0];
+    let param: number = params[0];
     if (param < 1) {
       param = 1;
     }
 
-    row = this._terminal.buffer.y + this._terminal.buffer.ybase;
-    ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
+    const row = this._terminal.buffer.y + this._terminal.buffer.ybase;
+    const ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
 
     while (param--) {
       this._terminal.buffer.lines.get(row).splice(this._terminal.buffer.x, 1);
@@ -558,16 +551,14 @@ export class InputHandler implements IInputHandler {
    * Erase Ps Character(s) (default = 1) (ECH).
    */
   public eraseChars(params: number[]): void {
-    let param, row, j, ch;
-
-    param = params[0];
+    let param = params[0];
     if (param < 1) {
       param = 1;
     }
 
-    row = this._terminal.buffer.y + this._terminal.buffer.ybase;
-    j = this._terminal.buffer.x;
-    ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
+    const row = this._terminal.buffer.y + this._terminal.buffer.ybase;
+    let j = this._terminal.buffer.x;
+    const ch = [this._terminal.eraseAttr(), ' ', 1]; // xterm
 
     while (param-- && j < this._terminal.cols) {
       this._terminal.buffer.lines.get(row)[j++] = ch;
@@ -619,9 +610,9 @@ export class InputHandler implements IInputHandler {
    * CSI Ps b  Repeat the preceding graphic character Ps times (REP).
    */
   public repeatPrecedingCharacter(params: number[]): void {
-    let param = params[0] || 1
-      , line = this._terminal.buffer.lines.get(this._terminal.buffer.ybase + this._terminal.buffer.y)
-      , ch = line[this._terminal.buffer.x - 1] || [this._terminal.defAttr, ' ', 1];
+    let param = params[0] || 1;
+    const line = this._terminal.buffer.lines.get(this._terminal.buffer.ybase + this._terminal.buffer.y);
+    const ch = line[this._terminal.buffer.x - 1] || [this._terminal.defAttr, ' ', 1];
 
     while (param--) {
       line[this._terminal.buffer.x++] = ch;
@@ -1203,14 +1194,13 @@ export class InputHandler implements IInputHandler {
       return;
     }
 
-    let l = params.length
-    , i = 0
-    , flags = this._terminal.curAttr >> 18
-    , fg = (this._terminal.curAttr >> 9) & 0x1ff
-    , bg = this._terminal.curAttr & 0x1ff
-    , p;
+    const l = params.length;
+    let flags = this._terminal.curAttr >> 18;
+    let fg = (this._terminal.curAttr >> 9) & 0x1ff;
+    let bg = this._terminal.curAttr & 0x1ff;
+    let p;
 
-    for (; i < l; i++) {
+    for (let i = 0; i < l; i++) {
       p = params[i];
       if (p >= 30 && p <= 37) {
         // fg color 8