Move mouse event handling to RFB class

Move the last remaining bits to the RFB class to keep things simple, as
the Mouse class no longer provides any real value.

docs/API-internal.md

@@ -11,9 +11,6 @@ official external API.
 
 ## 1.1 Module List
 
-* __Mouse__ (core/input/mouse.js): Mouse input event handler with
-limited touch support.
-
 * __Keyboard__ (core/input/keyboard.js): Keyboard input event handler with
 non-US keyboard support. Translates keyDown and keyUp events to X11
 keysym values.
@@ -35,52 +32,29 @@ callback event name, and the callback function.
 
 ## 2. Modules
 
-## 2.1 Mouse Module
+## 2.1 Keyboard Module
 
 ### 2.1.1 Configuration Attributes
 
-| name        | type | mode | default  | description
-| ----------- | ---- | ---- | -------- | ------------
-| touchButton | int  | RW   | 1        | Button mask (1, 2, 4) for which click to send on touch devices. 0 means ignore clicks.
-
-### 2.1.2 Methods
-
-| name   | parameters | description
-| ------ | ---------- | ------------
-| grab   | ()         | Begin capturing mouse events
-| ungrab | ()         | Stop capturing mouse events
-
-### 2.1.2 Callbacks
-
-| name          | parameters          | description
-| ------------- | ------------------- | ------------
-| onmousebutton | (x, y, down, bmask) | Handler for mouse button click/release
-| onmousemove   | (x, y)              | Handler for mouse movement
-
-
-## 2.2 Keyboard Module
-
-### 2.2.1 Configuration Attributes
-
 None
 
-### 2.2.2 Methods
+### 2.1.2 Methods
 
 | name   | parameters | description
 | ------ | ---------- | ------------
 | grab   | ()         | Begin capturing keyboard events
 | ungrab | ()         | Stop capturing keyboard events
 
-### 2.2.3 Callbacks
+### 2.1.3 Callbacks
 
 | name       | parameters           | description
 | ---------- | -------------------- | ------------
 | onkeypress | (keysym, code, down) | Handler for key press/release
 
 
-## 2.3 Display Module
+## 2.2 Display Module
 
-### 2.3.1 Configuration Attributes
+### 2.2.1 Configuration Attributes
 
 | name         | type  | mode | default | description
 | ------------ | ----- | ---- | ------- | ------------
@@ -89,7 +63,7 @@ None
 | width        | int   | RO   |         | Display area width
 | height       | int   | RO   |         | Display area height
 
-### 2.3.2 Methods
+### 2.2.2 Methods
 
 | name               | parameters                                              | description
 | ------------------ | ------------------------------------------------------- | ------------
@@ -113,7 +87,7 @@ None
 | drawImage          | (img, x, y)                                             | Draw image and track damage
 | autoscale          | (containerWidth, containerHeight)                       | Scale the display
 
-### 2.3.3 Callbacks
+### 2.2.3 Callbacks
 
 | name    | parameters | description
 | ------- | ---------- | ------------