Started reverse of scoll_left
Added sub_6E9F92 determines scroll action type
Added switch for scroll state
Added final part of input_scroll_left. Requires more testing
Deleted twice reversed function added note to prevent this happening. Labled global vars where noticed.
Added missing case still not working
fixed bug due to incorrect function calls
Cleaned up code to remove goto.
Merge pull request #215 from duncanspumpkin/input_scroll_left

Input scroll left
Implement draw_rain_window and call_draw_rain_func

Implement procedure (0x006842AF) as two methods: draw_rain_window and
call_draw_rain_func.
Avoid using global variable 0x00EE7850 by passing it as a parameter:
draw_rain_func. This global variable was only used by these procedures.
Rain has some visual artifacts in RCT2, specially when using game
windows. This implementation matches the original game, and thus has the
same artifacts.
Merge pull request #217 from marcotc/rain

Implement draw_rain_window and call_draw_rain_func