Order our New menu to distinguish App Engine Standard from Flexible

[briandealwis]

Adds placeholders to our GCP Toolbar's New menu to separate Standard options from Flexible.

Fixes #1536

[chanseokoh]

I wonder it's better to add a .separator suffix to the separator names.

[codecov-io]

Codecov Report

Merging #1542 into master will decrease coverage by -0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1542      +/-   ##
============================================
- Coverage     70.31%   70.28%   -0.04%     
+ Complexity     1302     1300       -2     
============================================
  Files           232      232              
  Lines          8942     8942              
  Branches        761      761              
============================================
- Hits           6288     6285       -3     
- Misses         2338     2339       +1     
- Partials        316      318       +2

Impacted Files	Coverage Δ	Complexity Δ
...clipse/appengine/facets/NonSystemJobSuspender.java	83.78% <0%> (-5.41%)	9% <0%> (-1%)
.../tools/eclipse/test/util/project/ProjectUtils.java	79.59% <0%> (-1.03%)	18% <0%> (-1%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 78772ab...5b1484d. Read the comment docs.

[elharo]

Let's not use a separator. The maven and non-maven standard projects are likely to be combined here.

[akerekes]

I'd use the separator until they're get combined.

[briandealwis]

I'm with @akerekes — I found I was having to hunt more without the separator.