This adds RemoveDevice() to ControllerInterface, fixes ExpressionParser
and some other code to support device removals without crashing,
and adds an IsValid() method to Device, to prepare for hotplugging.
The Setting class was used for both numeric values and booleans, and
other parts of the code had hacks to make it work with booleans.
By splitting Setting into NumericSetting and BooleanSetting, it is
clear which settings are numeric, and which are boolean, so there is
no need to guess by checking the default values or anything like that.
Also, booleans are stored as booleans in config files, instead of 1.0.
Do the scaling in the code that interprets the results.
This also removes the templatization of things and changes the interface
to always take a double.
This does add a bit more code to the users of GetState, especially when
having to deal with focus management, but this will be cleaned up very
soon, as focus and focus-related options will be centralized inside the
input platforms themselves, rather than spread out across all the input
plugins.
Change our DrawCoordinate helper method to take raw coordinate
positions, and draw the rectangle using that. This is a lot better
and more friendly than applying various crazy constants in the GetState
for the base/range.
Minor other alterations that relate to above as well.
Also added the PanicAlertT version of alerts for some error messages that
use PanicAlert. We want the user to actually understand why the error
occurred.
