refactor input (flags in particular) and add sub_6EA73F
fix #525, creating a ride crashes when footpath window is open
refactor window search functions
0x006BC3AC, 0x00405199, 0x00404E0D, sort audio functions by address, volume fading
0x006EC9CE
fix things
Fixes #527. Error caused by passing a variable a factor of 8 out.
Merge pull request #526 from zsilencer/master

fix some sound issues
Merge pull request #529 from duncanspumpkin/fix_527

Fix #527
Trying out a new technique for text input
Fix warning
New technique for text input.
Fixed bugs in existing method. Now has correct title and description
Added some of the suggested changes
Fix slight mistake with cursor position when using delete.
Added ok/cancel buttons. Added closing on main.
Cleaned up code, renamed variables, added comments. Switched over all existing text boxes to new code
Fix warning.
Added home, end key. Now uses host window colours.
Merge pull request #521 from duncanspumpkin/text_input

Text input window