Improve mouse manager

[tehKaiN]

Currently, mouse actions are collected using Intuition events. Also, current cursor codebase relies on OS stuff, which is conflicting with current custom copperlist implementation. There is a need to:

• Modernize API by integrating cursor into copperlist,
• Add ability to have 2 cursors on screen (vide Settlers split-screen mode),
• Display as 3bpp or 4bpp sprite with configurable sprite channel index (indices),
• Display as the only thing on sprite channel
• Display as part of sprite list for channel
• Grab cursor events directly for hardware - needed in Separate keyboard & mouse processing #13

[tehKaiN]

Dual mice position and 3 button states support through hardware has been implemented on branch hardware-input. Display is still not done.

[deuteros76]

Is there any example of how to use a mouse?

I'm looking at Open Fire's code. I've copied cursor.c, cursor.h and cursor.bm to my project and then I included the cursorCreate, cursorUpdate and cursorDestroy calls but nothing happens.

Maybe I missed something related to the Copper. Anyway it would be good to have an example of a mouse application in the showcase.

[tehKaiN]

Using mouse can be done with mouse manager. Displaying cursor can be done by sprite manager.

Until documentation is produced in #120, example code can be extracted from https://github.com/Last-Minute-Creations/slipgates and https://github.com/Last-Minute-Creations/openFire/ .

Displaying 4bpp cursor will be implemented in #212.