Dedicated console shift-down fix

This fixes the special console window used by dedicated mode not properly telling the game when shift is held down since the console improvements added in 2.1.17. This means shift+1 is properly interpreted as "!" again rather than 1, shift+- should be "_" rather than "-", etc.

Sorry LJSonic your problems from pre-2.1.17 are probably just your keyboard being for a different locale than the one most SRB2 players play with so I'm aware, I'm not sure what can be done for the time being. =V

Fun note, you can see how the game interprets un-executed input to the console window by playing normal (not dedicated) SRB2 with `-console`, which creates a second window for the console just like you'd see for dedicated mode. Drop down the console on the main SRB2 window, switch to the console window and type something in (DON'T PRESS ENTER), and you'll see the input appearing in the input space in the console window at the same time!

See merge request !163

console window uses ev_keyup too so don't worry about turning off

TD render fix 2: Electric boogaloo

This fixes TD's terminal stage freezing the game in a similar manner to Lava Mountain, except this time the FOFs aren't zero-height so it's a slightly different situation?

See merge request !160

Fixes TD's terminal from freezing the game this time, oh boy

TD rendering freeze fix

This is a fix for the Lava Mountain freeze issue from TD (KartKrew/TD#13) which can also occur in vanilla SRB2 as it turns out. Basically the issue occurs whenever an FOF with a single-patch texture with holes goes off the bottom of the screen far enough.

See merge request !159

Fix endless loop of R_DrawRepeatMaskedColumn if both sprtopscreen and sprbotscreen are CLAMPMAX (INT32_MAX)

This fixes the grid floors in TD's Lava Mountain freezing the game if they go off the bottom of the screen far enough (they have ACWRFL1A as the wall texture, which is a single patch texture with holes)

A spike bug no more

Jumping at spikes on FOFs in reverse gravity - most notably in ERZ3 - no longer teleports you downwards into the death pit beneath it.

See merge request !157

Fixed a stupid bug involving jumping at spikes on FOFs in reverse gravity caused by my own incompetence/assumptions.

This reverts commit 6476cf3c, reversing
changes made to 0186b90b.

Appveyor: compile with Mingw32 GCC 4.9.3

Let use an old GCC to compile SRB2

See merge request !112

Last few changes for 2.1.17

what it says on the tin

* Updated version number
* Added LJSonic to credits (and changed how I look in the credits to be less stupid)
* fixed resynching players seeing the host turn into a spectator for no reason

See merge request !155

Otherwise we can't force updates!

Netcode shit

*takes the cookie*

-Added a timeout for game state downloading to prevent definitive join freezes in some cases. The timeout has a minimum value of "jointimeout" and gets higher as the game state grows in size
-If the server tries to kick a joiner who is downloading the game state, they will get a timeout instead, because a regular kick would only happen once the game state has been downloaded
-Added a timeout for player ticcmd packets, again to prevent freezes to happen in some cases
-File/game state downloading is now faster, the speed is controlled by the "downloadspeed" cvar, in packets per tic
-The reason is now properly shown when the server refuses connection
-Changed the default values of "nettimeout" to 10 seconds (previously 15) and "maxsend" to 4 MB (previously 1)
-Added a "noticedownload" cvar that displays a message in the server console when someone is downloading a file

CMake: Fix nasm Linux builds

When compiling under Linux with CMake and nasm/yasm enabled, the operation would fail during linking with undefined symbols related to the tmap files.
This commit adds support for passing flags to the assembler and passes ```-DLINUX``` in order to compile.

After this change, binaries are successfully compiled with either nasm or yasm on Linux systems.
Tested on Ubuntu.

See merge request !153

Added transmaps to non modifying lump list.

CMake: split inline ASM code from vid_copy.s code

See merge request !151

Update Code::Block project

See merge request !145