Add support for Round Icon

[jamesmontemagno]

Fixes Bugzilla #51207

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[jonpryor]

Right idea, not enough implementation. Bug #51207 is actually a duplicate of Bug #49253, and it's a subset at that.

Missing from this PR is the addition of a RoundIcon property for:

• IntentFilterAttribute
• PermissionAttribute
• PermissionGroupAttribute
• PermissionTreeAttribute
• ApplicationAttribute
• InstrumentationAttribute
• ServiceAttribute
• BroadcastReceiverAttribute
• ContentProviderAttribute

[jonpryor]

build

[jonpryor]

build

[jonpryor]

@jamesmontemagno: Please create a PR that applies against master, not the cycle9 branch. We can cherry-pick to the cycle9 branch once it's on master.

(This is probably why the PR builder keeps hanging. I don't think unit test execution works on the cycle9 branch...as they didn't start working on master until November 22/a5946eb5, after cycle9 branched.)

[jonpryor]

This is superseded by PR #349.