Parse error: Missing ':' when using #comments in .pa.yaml source files about powerapps-tooling HOT 3 CLOSED

Rather than block the pack - could comments be allowed but a warning emitted to indicate that they won't be retained if you round trip - I can think of situations where comments would be useful in code-gen type scenarios.

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We do not support Yaml comments in the .pa.yaml file. This is because we they would get dropped during a round trip.
We do support PowerApps comments in the formulas (use // )

We should be giving parser errors in the cases above to explicitly warn which parts of Yaml are not in the supported subset.

We're capturing the docs for this here:
https://github.com/microsoft/PowerApps-Language-Tooling/blob/master/docs/YAMLFileFormat.md#yaml-comments

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We'll allow comments on their own line.
But we still reject yaml comments on a line with other formulas - because it's too easy that the intention was actually a formula and we're trying to protect against confusion (and against the formulas being accidentally interpreted as yaml comments and stripped )

Screen1 As screen:
    # A comment    <-- this yaml comment is ok 
    FillColor: = # FF00CC   <-- this is an error.  Yaml comment not allowed,     

We'll give a warning now like:

Pack: D:\dev\pa2\Samples\FullDemo\Weather\MyWeather_src --> D:\dev\pa2\Samples\FullDemo\Weather\temp.msapp
Warning PA2010: Yaml comments don't roundtrip. at Screen1.pa.yaml:14,1-14,1
0 errors, 1 warnings.

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