Ninja bugfixes/minor code cleaning/energy cost changes

The changes in energy cost may not fall under the umbrella of bugfixes, tell me if I need to have a forum referendum or something.

Stuff changed:
Phase shift now actually costs energy to perform (400)
-Minor grammar correction
-EM Burst now costs 2000E, up from the listed cost of 1000E and down from the actual cost of 2500E.
-Energy blade's listed energy cost now correctly reflects the actual activation cost (500E)
-Energy Star now costs 800E, down from the listed cost of 1000E and actual cost of 5000E, up from the intended (maybe?) cost of 100E.
-Energy net now correctly holds the target in place. Also costs 7000, down from listed cost of 8000 and what was apparently an actual cost of 50000 which never actually got taken from the battery for some reason
-Changed all values of X other than 1, 2, and 3 for ninjacost in ninja_abilities.dm to 0
-Altered certain cell.use procs in ninja_abilities.dm to multiply C by 10 instead of 100 for consistency
-Added "captured" variable, makes mob stand, unable to move, and anchored.
-Made adminspawn ninja start with an oxygen tank