4.2.0-BETA1 Preview of form support, many i18n fixes, multi-window

NOTE: This is a BETA release and should only be used for testing and evaluation.

Note that ideally this should be used with the latest tcMenuLib from master, although it should work for most situations with 4.1.x. Some of the most notable improvements in 4.2 are as follows:

• Along with the release of the mobile and user-centric remote control UI (Embed Control) this release has basic form editing support to allow for simple creation of grid-based layouts for the UI.
• This is the first release to directly support PicoSDK without Arduino. It is now possible to directly use PicoSDK with CMake. There is even an example menu. See https://github.com/davetcc/tccLibs for more details.
• Fixes and improvements to the custom/no display plugins to ensure they work in all scenarios
• What was the standalone Java Embed Control version is now combined into tcMenu Designer. This is because it is now more of a developer tool given that we'd expect most to use the store packaged version.
• Major fixes for the i18n support
• File -> New now opens a completely new window, allowing for more than one project to be loaded at once.

As this is a beta release, the Linux version will be built if needed, let me know in the attached discussion.