Fixes in qt build scripts.
Reduce size of mingw builds by disabling data sections for resid library.
Fix processing of generated sources located in separate folder.
zxtune-qt: refactor playlist operations. Extract statistic-related types to separate files.
zxtune-qt: move export/convert operations types to separate files.
zxtune-qt: fix some parameters reset after language change.
Fix envelope generator tone analysis.
zxtune-qt: refactor conversion-related code.