Fix maps yc_c2a5c

Fix maps yc_c2a3a yc_c2a4a

Fix maps: yc_c1a1c, yc_c1a3a, yc_c2a1a, yc_c2a3b;

Update MAPS yc_c2a1a to yc_c2a5i.
1. Added Legacy Mode.
2. Fixed difficulty mode ( Fixed npc armor. It will become easier to kill them. )
3. Fixed some situations with npc.
4. Maps updated to Black Mesa 1.5
5. Fixed maps yc_c1a2a, yc_c1a2b, yc_c1a4b

Fix maps yc_c1a0a

Fix yc_lobby start Dedicated Server

Update MAPS yc_c0a0a to yc_c1a4e.
1. Added Legacy Mode.
2. Fixed difficulty mode ( Fixed npc armor. It will become easier to kill them. )
3. Fixed some situations with npc.
4. Maps updated to Black Mesa 1.5

Changes on maps yc_c1a1a by yc_c1a4e Black Mesa v1.0
- add legacy mode.
Survival Left
Legacy Right

Changes on maps yc_c4a1a by yc_c5a1a
1. Added start button.
2. Added a primitive death system. After death, the player enters the room with a map restart. At least two players can restart the map. A player can be returned to the game only when another live player reaches the checkpoint or a map change.
3. Strengthened moderately some npc.


Fixes on maps yc_c3a1a by yc_c3a2k:
1. Removed all teleports that caused random death of players. Instead of teleports, open doors.
2. Fixed tickrates for cooperative mode.
3. Card change will now be announced in chat and with a 40 second delay.
4. yc_c4a2b by yc_c4a2c fixed t-pose player. Restart the game if t poses appear!