Feature/regex and new defaults

[solidiquis]

Breaking changes warning

This branch introduces a number of changes that mark the beginning of v2.0.0. On top of supporting regular expression search and altering how to leverage glob-based searching, some arguments were renamed or deprecated.

Additions

• Searching via regular expressions via -p, --pattern. To do glob-based searching use -p, --pattern in conjunction with --glob or --iglob, the latter of which enables case insensitive glob searching.
• File count now included in output.
• Disk usage now displays only on the left as a separate column from the tree.
• Empty match set now displays text rather than a single empty directory.

Deprecated arguments

• -g, --glob, --iglob, --glob-case-insensitive
• -c, --count

Renamed arguments

• -H, --hidden -> -., --hidden
• -p, --prefix -> -u, --units
• -S, --follow-links -> -L, --follow
• -i, --ignore-git-ignore -> -i, --no-ignore
• --ignore-git -> --no-git

New defaults

• Disk usage now defaults to displaying physical size rather than logical size by default.

Other changes

• Help text modified slightly for extra clarity.