New functions & Minor changes

* cellGameBootCheck, cellSysutilGetSystemParamString partially
implemented.
* Improved debug SELF loader (I applied DH's changes over another part
of code that Hykem wrote).
* Added checkbox in the Config>Settings menu to ignore Read/Write errors
(disabled by default).
* Minor issues.
Merge branch 'master' of https://github.com/DHrpcs3/rpcs3