DatabaseQuery: move value separator define to header
settings: fix CSettingNumber::fromString()
settings: use CSetting::CheckValidity() instead of CSetting::FromString() for input validation
settings: add CSetting::SetCallback() instead of using friendship with CSettingsManager
settings: add cosmetic comment to CSetting
move ISliderCallback into its own header file
guilib: don't abuse and redeclare SPIN_CONTROL_TYPE_FOO
CGUISliderControl: fix SetIntValue() and SetFloatValue()
settings: add slider control
settings: integrate slider control into GUI
settings: add CSettingControlCreator implementation of ISettingControlCreator for easier re-use
settings: add CSettingCreator implementation of ISettingCreator for easier re-use
settings: make use of CSettingCreator and CSettingControlCreator in CSettings
settings: add CSettingConditions with all simple and complex conditions
settings: make use of CSettingConditions in CSettings
settings: change signature of SettingConditionCheck to include the CSetting instance instead of just its identifier
settings: adjust the implementations of SettingConditionCheck
settings: add CGUIDialogSettingsBase
settings: add CGUIDialogSettingsManagerBase
settings: make use of CSettingControlCreator in CGUIDialogSettingsBase