TMIMETypeCache does not know SVG

[Christian Budde]

Currently the TMIMETypeCache in the unit dwsWebServerHelpers is not aware of SVG images (but GIF).

In order to suit modern web development with this unit it would make sense to add something like

Prime('.svg', 'image/svg+xml');

to the constructor TMIMETypeCache.Create;

[Eric Grange]

TMIMETypeCache is now thread-safe + fixed Issue #70

→ <<cset ebfecadd0db8>>