Merge pull request #3 from deztructor/master

[lib] store IsolateContext separately from isolate data
[lib] CUTES_FN_PARAM2_CONST

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[core] QByteArray: exposing mid/left/right/indexOf

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[core] access stdin in Process

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>