KeymanWeb 10.0 alpha (#124)

* Fixes #107 - move __BUILD__ and dfltLayout variables into tavultesoft object

* Cherry-pick fix for error from attachment api rework #114

* Fixup missing __BUILD__ reference

* Update header version number

* Fixup broken getDefaultKeyObject() call so we can release 2.0

* Fixes #118 - longpress menu sometimes missing base key on phone devices (#134)

* Add note to build scripts to remind devs to make changes to both scripts