v0.7.0

v0.7.0

Features:

• Add Backend trait with CrosstermBackend and TermalBackend
  implementations
• Add option to change Term backend
• Add Application trait and Term::run for managed main loop
• Add Term::draw for size-aware rendering using Frame context
• Add option to force scrollbar visibility to List and Table
• Add automatic terminal restoration on crash or when Term dropped

Changes:

• Term now requires a backend type (such as Term::<Backend>::new())

Fixes:

• Fix Modifier incorrectly coloring text blue
• Fix ProgressBar thumb styling issues