aycli: simplify backend creating.
Fix build for clang.
zxtune-qt: auto-select first added module for playback.
Constants and default value of zxtune.core.aym.type parameters.
Constants and default value of zxtune.core.aym.interpolation parameter.
Constants and default value of zxtune.core.aym.duty_cycle/duty_cycle_mask parameter. Code cleanup.
Constants and default value of zxtune.core.aym.layout parameter.
Constants and default value of zxtune.core.saa.interpolation parameter.
Constants and default value of zxtune.core.sid.interpolation parameter.
Constants and default value of zxtune.core.sid.filter parameter.
Constants and default value of zxtune.core.dac.interpolation parameter.
zxtune-android: synchronize default parameters.