removed tw_state_save function (unused)

- removed function def from tw-state.c
- removed function decl from ross-extern.h
removed dead code from tw-state.c
Removed tw_state_alloc, put relevant code in tw-lp.c

- removed function decl from ross-extern.h
- removed function def from tw-state.c
- put code for lp->cur_state allocation in tw_init_lps (tw-lp.c)
removed g_tw_sv_growcnt global variable (unused)

- removed decl from ross-extern.h
- removed def from ross-global.h
replaced function call to tw_state_rollback with relevant code

- replaced function call in tw-event.c
removed tw_state_rollback function

- removed function decl from ross-extern.h
- removed comment ref from tw-event.c
- removed function def from tw-state.c
removed tw-state.c

- removed comment in ross-extern.h
- removed file
- removed inclusion from cmake
removed state_qh from tw_lp

- removed from tw_lp struct in ross-types.h
cleaned up CMakeLists files

- removed testing support (ctest and unity)
- removed comments of old settings
- removed IO, models, ROSS.Net, NetDMF options
- removed oxygen building