Added wxButton declarations and definitions.

Its mostly blank, SetLabel(...) does work and it you can construct it and assign it to parent frame.
However it uses temploraly members such as m_parentId until base classes are fully implemented.
Added wxControl declarations and definitions.

They are blank, just for wxButton demosntration.
Enabled wxUSE_BUTTON and wxUSE_CONTROLS in chkconf.
Updated files.bkl and Makefile to match new files.

Adds params.cpp, button.cpp, control.cpp to makefile.
Added special case in configure for android shared lib.

I am still not sure what is to add here, but at this place disabling of .0.0.0 extension will take place.