refactor(fileTree): remove tree decorations from template

- remove visual decorative elements from the tree template
refactor(fileTree): skip full BQ map until loading is cancelable
refactor(fileTree): simplify and sort nodes

- simplify node states and styles
- sort folders first, then children by name
- hide hidden files (really just files starting with .)
feat(fileTree): add full row selection for nodes and depth indentation
feat(fileTree): add basic file tree icon support

- use FontAwesome for fonts of, uhh, an awesome nature.
Merge branch 'tree-trimming'