Delay initialization of the visual shader editor UI

This makes sure that the theme is ready to be used before the
methods is called.
Also add missing icons (and update some existing).

Co-authored-by: Samuel Wilson <yokomeshi@gmail.com>

editor/icons/Projection.svg

@@ -0,0 +1 @@
+<svg height="12" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m0 2v8h2v-2c.772 0 1.468-.3 2-.779v2.779h2v-3c0-.552.448-1 1-1h1v-2h-1c-.781 0-1.486.306-2.02.795-.107-1.56-1.393-2.795-2.98-2.795zm8 4v2c0 1 1 2 2 2h1c1 0 2-1 2-2v-2c0-1-1-2-2-2h-1c-1 0-2 1-2 2zm6-4v2h2v-2zm-12 2c.552 0 1 .448 1 1s-.448 1-1 1zm8 2h1v2h-1zm4 0v3c0 .552-.448 1-1 1h-1v2h1c1.657 0 3-1.343 3-3v-3z" fill="#44bd44"/><path d="m7 4c-1.657 0-3 1.343-3 3v3h2v-3c0-.552.448-1 1-1h1v-2z" fill="#fff" fill-opacity=".39216"/></svg>

editor/icons/Transform3D.svg

@@ -1 +1 @@
-<svg height="12" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m0 2 2 4-2 4h2l.9082-2.1816 1.0918 2.1816h2l-2-4 2-4h-2l-.9082 2.1816-1.0918-2.1816zm6 8h2v-2h1v-2h-1v-1c.0000096-.55228.44772-.99999 1-1h1v-2h-1c-1.6569 0-3 1.3431-3 3zm4-6v6h2v-2l1 1 1-1v2h2v-6h-2l-1 2-1-2z" fill="#f68f45"/><path d="m9 2a3 3 0 0 0 -3 3v5h2v-2h1v-2h-1v-1a1 1 0 0 1 1-1h1v-2z" fill="#fff" fill-opacity=".39216"/></svg>
+<svg height="12" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m4 4h3.349c0 .549-.451 1.267-1 1.267v1c.549 0 1 .326 1 .874 0 .549-.451.859-1 .859h-1v2h1c1.07 0 2.063-.573 2.598-1.5s.535-1.806 0-2.733c-.104-.18-.227-.348-.366-.502.139-.153.261-.32.366-.498.262-.457.398-.64.398-.767h.004v-2h-9.349v2h2v6h2zm6 6h2c1.428 0 2.751-.764 3.465-2 .713-1.236.713-2.764 0-4-.714-1.236-2.037-2-3.465-2h-2zm2-6c.714 0 1.376.382 1.732 1 .357.618.357 1.382 0 2-.356.618-1.018 1-1.732 1z" fill="#f68f45"/><path d="m6.00006 2v2h1.349c0 .549-.451 1.267-1 1.267v1c.549 0 1 .326 1 .874 0 .549-.451.859-1 .859h-1v2h1c1.07 0 2.062-.573 2.598-1.5.535-.927.535-1.806 0-2.733-.104-.18-.227-.348-.366-.502.139-.153.261-.32.366-.498.262-.457.398-.64.398-.767h.004v-2z" fill="#fff" fill-opacity=".39216"/></svg>

editor/icons/Vector4.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 12" xmlns="http://www.w3.org/2000/svg"><path d="M1 4v6h2a3 3 0 0 0 3-3V4H4v3a1 1 0 0 1-1 1V4zm5 3a3 3 0 0 0 3 3h1V8H9a1 1 0 0 1 0-2h1V4H9a3 3 0 0 0-3 3z" fill="#de66f0"/><path d="m12.467 1.523-1.526 5.694 3.02-.015.044 3.795h1.98V5.116h-2.373l.943-3.595z" fill="#eba2f6"/></svg>
+<svg clip-rule="evenodd" fill-rule="evenodd" height="12" stroke-linejoin="round" stroke-miterlimit="2" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m11 3v5h3v3h2v-9h-2v4h-1v-3zm-10 1v6h2c1.646 0 3-1.354 3-3v-3h-2v3c0 .549-.451 1-1 1v-4zm5 3c0 1.646 1.354 3 3 3h1v-2h-1c-.549 0-1-.451-1-1s.451-1 1-1h1v-2h-1c-1.646 0-3 1.354-3 3z" fill="#f066bd"/><path d="m11 3v5h3v3h2v-9h-2v4h-1v-3z" fill="#fff" fill-opacity=".39216"/></svg>

editor/icons/Vector4i.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 12" xmlns="http://www.w3.org/2000/svg"><path d="m1 4v6h2c1.6568542 0 3-1.3431458 3-3v-3h-2v3c0 .5522847-.4477153 1-1 1v-4z" fill="#de66f0"/><path d="m8.482 1.523-1.526 5.694 3.02-.015.043997 3.795h1.980003v-5.881h-2.373l.943-3.595z" fill="#eba2f6"/><path d="m13 2v2h2v-2zm0 4v4.000001h2v-4.000001z" fill="#5abbef"/></svg>
+<svg height="12" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m7 3v5h3v3h2v-9h-2v4h-1v-3zm-6 1v6h2c1.657 0 3-1.343 3-3v-3h-2v3c0 .552-.448 1-1 1v-4z" fill="#f066bd"/><path d="m7 3v5h3v3h2v-9h-2v4h-1v-3z" fill="#fff" fill-opacity=".39216"/><path d="m13 2v2h2v-2zm0 4v4h2v-4z" fill="#5abbef"/></svg>

editor/icons/uint.svg

@@ -0,0 +1 @@
+<svg height="12" viewBox="0 0 16 12" width="16" xmlns="http://www.w3.org/2000/svg"><path d="m5 2v2h2v-2zm2 2v2h-2v-2h-2v4c-.5522847 0-1-.4477153-1-1v-3h-2v3a3 3 0 0 0 0 .0507812 3 3 0 0 0 3 2.9492188h6v-4c.5522847 0 1 .4477153 1 1v3h2v-3c0-1.6568542-1.343146-3-3-3zm5 3c0 1.6568542 1.343146 3 3 3h1v-2h-1c-.552285 0-1-.4477153-1-1v-1h2v-2h-2v-2h-2z" fill="#5abbef"/><path d="m5 10v-6h-2v4a1 1 0 0 1 -1-1v-3h-2v3a3 3 0 0 0 3 3z" fill="#fff" fill-opacity=".39216"/></svg>