Always use critical struct for freeaim and jump

[SoDOOManiac]

While cleaning up my amateur mistakes to prepare the new release of So Doom I noticed that Crispy code looks to contain flaws that may be seldom triggered.
The physical gameplay tweaks that affect demo sync and netplay should be set up as crispy->criticalfield in 4 files only:
compatibility.c, d_main.c, m_crispy.c and m_menu.c.
In all other files the critical structure pointer should be used instead of crispy, critical points to crispy_s struct in singleplayer (non-demo, non-netgame) and to the all-zeros-initialized critical_s otherwise.

I cleaned out what looks to me like the wrong use of crispy-> instead of critical->.

[fabiangreffrath]

Thank you very much!