Add pw_justlaunched to tell modders when a player launches from a slope

See merge request STJr/SRB2!792

Allow more options for when the titlecard shows up

See merge request STJr/SRB2!765

M_Ftrim

See merge request STJr/SRB2!798

- Use '%f' instead of '%g' to avoid going scientific. Should also fix some
  compiler warnings.
- The trailing zero trimming code is now useful. It started on the terminating
  byte before and wouldn't have done anything with '%g' anyway.
- Use the absolute fractional value to avoid a sign.

Rolling

See merge request STJr/SRB2!690

"+" command line parameters make sense

See merge request STJr/SRB2!707

Trim the trailing zeros off floats for cvars

See merge request STJr/SRB2!716

Extra emblem hint display

See merge request STJr/SRB2!721

Local Color Table for GIF movie mode

See merge request STJr/SRB2!742

Expose stoppedclock to Lua

See merge request STJr/SRB2!771

Don't freeslot TOL_ twice

See merge request STJr/SRB2!779

Get rotated sprites with v.getSprite(2)Patch

See merge request STJr/SRB2!773

Clean up the mess that is extracolormap_t::fog

See merge request STJr/SRB2!790

Allow models for skin/sprites with same name

See merge request STJr/SRB2!767

Fix overtime not working

See merge request STJr/SRB2!784

No more console in menus because codebase sucks xd

See merge request STJr/SRB2!791

This reverts commit ef3d462e.

Fix object shadow not appearing for mid-joiners

See merge request STJr/SRB2Internal!627

Fix dedicated servers not running gamelogic

See merge request STJr/SRB2!788

Note to future testers:
Remember to test dedicated servers before merging.
And splitscreen also.