[TypeScript] Codegen class rename for Angular and AngularJS to reflect naming guidelines

[damienpontifex]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master for non-breaking changes and 3.0.0 branch for breaking (non-backward compatible) changes.

Description of the PR

see http://angularjs.blogspot.com.au/2017/01/branding-guidelines-for-angular-and.html for reason for naming change.

Previously TypescriptAngular referred to AngularJS and TypescriptAngular2 referred to Angular. This changes makes it clearer by using the names TypescriptAngularJs and TypescriptAngular to refer to AngularJS (1.x) and Angular (>2.x)

Generator language flag was already following this convention so usage shouldn't change but class naming follows this convention now.

[wing328]

@damienpontifex thanks for the PR.

cc @Vrolijkx @taxpon @sebastianhaas @kenisteward @TiFu

[wing328]

@damienpontifex when you've time, I wonder if you can rebase this PR on the latest master to help resolve the merge conflicts.

[damienpontifex]

@wing328 done but build failures after rebase. Will have to spend a little longer resolving

[wing328]

@damienpontifex please remove this line.

[damienpontifex]

@wing328 I think that's fixed it all. I can squash the changes into one commit when/If merged.

[damienpontifex]

@wing328 any further thoughts/feedback on this?

[wing328]

@damienpontifex last time I checked, this PR is good to merge but I want to merge #6130 first

[wing328]

#6310 has been merged into master.

Will merge this one over the weekend.

cc @Vrolijkx @taxpon @sebastianhaas @kenisteward @TiFu

[wing328]

@damienpontifex thanks for the PR, which has been merged into master. I've made the following minor changes:

d8fceda - update TS Angular-related Windows batch files
ccfe7f5 - minor fix to TS AngularJS bin script