[windows] Get All Processes names in c.

Adds getAllProcesses function that returns all the processes names alongside with their pids.
Also, a bit of formatting.
[windows] Add pgrep functionality.

GetAllProcesses returns all the processes running in the system alongside with their image name (in Device format).

GrepProcesses runs a regexp against all the processes and return the ones whose name matches.

pgrep.go provides a functionality similar to the one of pgrep in Linux.