Final code fixes and minor cleanup

• Fixed a couple crashes on insert-typing a char at index 0, and pasting at index 0. The former was my fault when switching INT32 to unsigned.
• Activate Kart splitscreen chat code behind #define NETSPLITSCREEN
• Disable chat by adding splitscreen check to OLDCHAT
• Draw up and down scroll arrows the 2.2 way, by string
• Cleanup commit to adjust comment whitespace and rename stop_spamming_you_cunt (yeah fuckaj can stay but I draw the line at cunt, sorry :X )

Pending whether I can actually draw the arrows correctly; hold tight while I figure out why SLADE's not firing up... works fine, fire away

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• e0176670 - Correct splitscreen check in OLDCHAT

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• 64007290 - Extend HU_FONTSTART to STCFN022 (from 2.2)
• b6db8206 - Use TinyFont for chat arrows

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The new arrow drawing code runs fine. You'll have to tell me if this looks misaligned

(edit: in fact yeah it is... gotta move down arrow up a few pixels)

I think this is better. Pulled the coordinates from Kart

unmarked as a Work In Progress

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• 56320a35 - Use TinyFont for chat arrows

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• a9fb17da - Revert "Extend HU_FONTSTART to STCFN022 (from 2.2)"

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The arrow chars are part of the font now, so I'll put that in a separate merge request on public in case I rollback patch.dta last minute. If I do roll it back, I'll re-insert the arrow drawing code after CHAT is merged.

This merge is good to go.

mentioned in merge request STJr/SRB2!398 (merged)

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• 6ebc41a5 - Check target < MAXPLAYERS before PM

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• 3703a032 - Buildbot fixes

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merged

mentioned in commit 809bb8a9