Name peep variables for current train and car
Fix finding peep on ride news items

Peep's current_* variables were offset by 1. Also fixed comparison
between 32-bit and 16-bit ints.
Change peep news item enum names
Add rct_car sprite and tidy up news locator

Also add (x,y,z) coordinate variables for rct_peep
Fix comments
fix case and add author to source code header
rename current day to current month ticks
add game flag for development only below tree height
Changed screenshot format from BMP to PNG (using LodePNG)

NOTE: The little popup window ("Screenshot saved to disk as") still
displays a BMP filename, but it saves a PNG file to disk.
finish scenario start and add park size calculate
Found nausea peep variable
Merge branch 'master' of https://github.com/IntelOrca/OpenRCT2
label nausea with offset
Merge branch 'duncanspumpkin-master'
Merge branch 'screenshot-png' of https://github.com/atmaxinger/OpenRCT2 into atmaxinger-screenshot-png
allow BMP to still be saved with PNG as default
Merge branch 'atmaxinger-screenshot-png'
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/rct2.h
	src/window_game_bottom_toolbar.c