Added FP 15 swfversion condition

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>
Minor rewrite to avoid multiple catch blocks in one statement (JS no likey)

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>
Increment and counterpart don't work with FlexJS '_get()' and '_set()'

In FlexJS, all properties are converted to a set of methods, with '_get' and '_set' postfix. Calling an increment on a property in AS - myProp++ - will thus translate to 'myProp_get()++' in JS. And JS strongly objects to that syntax.

Signed-off-by: Erik de Bruin <erik@ixsoftware.nl>