Use only std::string in TWFunc::Get_Folder_Size

* Fixes crash which could occur with too deep path because
  of too much memory allocated on stack
fix wrong debuging output of used BUILD FLAGS in data.cpp
Fix misspelling and white space on fix perms

Thanks to Space- for pointing it out
Merge "fix wrong debuging output of used BUILD FLAGS in data.cpp" into twrp2.4
Merge "Fix misspelling and white space on fix perms" into twrp2.4
Merge branch 'twrp2.4' of git://github.com/TeamWin/Team-Win-Recovery-Project into twrp
Infamous recovery

Change-Id: I085fd59b256bbb73de291f1e2fe446c83c115985
Make icons slightly larger & reduce separator size

Change-Id: I53b8ddc40ed2442b282fae38a826461278669d50
Update graphics

Change-Id: I11430555897a1bd700c7867fa4d674bd7f94fa06