Bugfix: simple-call-tree-visit, simple-call-tree-view, simple-call-tree-set-attribute

Altered items:
simple-call-tree-major-mode-alist, simple-call-tree-analyze,
simple-call-tree-next-func, simple-call-tree-set-attribute,
simple-call-tree-view-function, simple-call-tree-visit-function
Finished simple-call-tree-mark-by-face

Altered items:
simple-call-tree-mark-by-face
Implemented kill marked items and revert buffer

Some other minor bug fixes.

Altered items:
simple-call-tree-mode, simple-call-tree-list-callers-and-functions,
simple-call-tree-reverse, simple-call-tree-sort-by-num-descendants,
simple-call-tree-sort-by-name, simple-call-tree-sort-by-position,
simple-call-tree-sort-by-face, simple-call-tree-sort-by-todo,
simple-call-tree-sort-by-priority, simple-call-tree-sort-by-size,
simple-call-tree-sort-by-mark, simple-call-tree-invert-buffer,
simple-call-tree-change-maxdepth, simple-call-tree-toggle-duplicates,
simple-call-tree-apply-command, simple-call-tree-hide-marked,
simple-call-tree-kill-marked, simple-call-tree-unhide,
simple-call-tree-revert
Utilize org-todo-keyword-faces, org-tag-faces & org-priority-faces

Altered items:
simple-call-tree-org-todo-keyword-faces,
simple-call-tree-org-tag-faces, simple-call-tree-org-priority-faces,
simple-call-tree-tags-to-string, simple-call-tree-insert-item