add animation gifs for new rack-mount systems, also update rbuild and the main readme to reflect these changes

rack-mount/enclosed-box/README.md

@@ -0,0 +1,12 @@
+
+
+# Enclosed Box Mounting System
+
+![demo](./animate.gif)
+
+Please see [entry.scad](./entry.scad) for config and building. Make sure the correct rack profile is configured in [rackFrame.scad](../../config/rackFrame.scad).
+
+- This system comprises three parts: two side rails, and a front plate.
+- This system is useful for mounting heavier box-shaped things. It works by first sliding in the box inside the side rails (which secures `x`, `z`, and one half of the `y` axis), and then mounting the front plate along the main rails.
+- Side rails will most likely require supports to print.
+- For wider boxes (nearing the `maxUnitWidth` of the rack), you will have to set `recessSideRail` to true. This is so the side rails will not collide with the main rack rails. 

rack-mount/patch-panel/README.md

@@ -0,0 +1,9 @@
+# Patch Panel
+
+
+![demo](./animate.gif)
+
+Please see [entry.scad](./entry.scad) for config and building. Make sure the correct rack profile is configured in [rackFrame.scad](../../config/rackFrame.scad).
+
+- Mount RJ-45 Keystone jacks with this part.
+- Single part. Can be printed without supports.

rack-mount/tray/README.md

@@ -0,0 +1,9 @@
+# Tray Mounting System
+
+![demo](./animate.gif)
+
+Please see [entry.scad](./entry.scad) for config and building. Make sure the correct rack profile is configured in [rackFrame.scad](../../config/rackFrame.scad).
+
+- Mount on front rails. 
+- Single Part, can also be printed without supports.
+- Includes support for custom bottom screws (`mountPoints` in config). This is useful for SBCs and mini PCs with bottom screws.

rack-mount/tray/animate.scad

@@ -16,5 +16,5 @@ module animateTraySystem(at=$t) {
   dx = abs(lerp(a=-40, b=40, t=at));
   dy = abs(lerp(a=-30, b=30, t=at));
 
-  traySystem(trayU=trayU, baseWidth=x+dx, baseDepth=y+dy, mountPoints=[]);
+  traySystem(trayU=trayU, baseWidth=x+dx, baseDepth=y+dy, mountPoints=[], backLipHeight=8);
 }