Revert "[System] Mono friendly QEncodedStream"
Revert "[System] Mono friendly QEncodedStream"

This reverts commit 5a7abfc46054c02fabde6398b7514a0fcff06cb7.

The code should be added to Mono's Uri instead.

esdrubal/referencesource,stormleoxia/referencesource,mono/referencesource,evincarofautumn/referencesource