Tweak order of buttons in rce toolbar
Tweak order of buttons in rce toolbar

Moves LTI buttons into own group on toolbar and slides plugins and
LTI groups to the left of alignment group.

Also renames last group to 'Miscellaneous' since it no longer
contains apps.

flag=rce_enhancements
fixes LS-1302

Test plan:
 - Open an RCE
 - Expect to see groups in toolbar in this order: styles,
   formatting, plugins, apps, alignment, misc
 - Expect buttons to work as expected

Change-Id: Icd432c8bd480cdcc632878e54f2211c25be829f7
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/244702
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Ed Schiebel <0ca8a83847a5889cf05cb219c0ab09f6b646243b@instructure.com>
QA-Review: Robin Kuss <0b206b54367b2de0334896ea45826f0e3194bd35@instructure.com>
Product-Review: Jackson Howe <318c10a818c1b1f2ec50cdcb1827b2c6c5ebd7dc@instructure.com>

instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms