Remote access: improve icon quality

Description

The remote access UI combines project supplied SVGs with platform-specific icons served via API. At present, the endpoint delivers rasterized vector drawables rendered for a specific size. Converting from vector drawable to browser-compatible SVG, instead of drawable to bitmap, maintains quality but slightly increases file size for small images. In order to address the file size increase, compression support was added to the endpoint to reduce size, except for application/json as compression caused significant delays.

Motivation and Context

Converting drawables to SVG on the fly avoids maintaining duplicate icon formats.

How Has This Been Tested?

All drawable resources were accessed via the API through a simple html web page. No exceptions were observed.

Gradients and clip paths work as expected. See /icon?id=ic_emoji_eyes_heart&width=128 and /icon?id=ic_icon&width=128

Types of changes

• Enhancement (non-breaking change which cleans up / improves existing functionality)

Checklist

• I have read the CONTRIBUTING section of the README document.