Mark new-style log names as loaded in addons menu

See merge request STJr/SRB2Internal!340

* Improve logfile print. (I know Steel wanted it gone entirely, but I feel like it's relevant to have it in game..?)

Camera fixes

Closes #105

See merge request STJr/SRB2Internal!303

New animated DSZ kelp (plus ACZ cacti & DSZ coral)

See merge request STJr/SRB2Internal!332

Some Player fixes and enhancements

Closes #216, #219, #222, and #224

See merge request STJr/SRB2Internal!334

Better directory structure

See merge request STJr/SRB2Internal!321

Support W_VerifyFile on PK3

See merge request STJr/SRB2Internal!328

Timerres fix

Closes #213

See merge request STJr/SRB2Internal!338

Camera Options submenu

See merge request STJr/SRB2Internal!337

Use byteptr.h macros in flats png

See merge request STJr/SRB2Internal!339

Disable some code which sometimes makes the player enter walking frames when jumping up to a platform, such as the CEZ3 buttons, despite still being in jumping mode.

If this causes more problems than it solves it can be reverted, but doing a bunch of playthroughs of DSZ1/2, GFZ1, and CEZ3 didn't seem to uncover anything, so I'm tentatively putting it in this branch.

* Fix some other landing weirdness with CA_BOUNCE.

* Lower default swim animation speed.
* Make speed of flight/swim animation increase whenever mashing jump.

Pain sound fixes

See merge request STJr/SRB2Internal!335

* Fix native MF_PAIN sound extension being limited to UINT8 range, which only became evident when the new s1/2/cd/3db/kc sfx were added.
* Make the pain-causing cactodes have DMG_SPIKE.

Correct location of MT_CACTI10 and MT_CACTI11 in relation to their positions given in info.h and dehacked.c (fixes several ACZ-related crashes)

Properly scrub the player struct clean between level transitions. (Good chance this fixes our new bug where the player gets stuck in their standing pose when the map begins..?)

Fix Knuckles being able to climb up solid midtextures by repeatedly gliding at them. (addresses #174 checkbox 2)