v0.25.0

• Add feature_peripheral option which generates cfg features for each peripheral
• Use register aliases in RegisterBlock (both structure and mod)
• Create aliases for derived registers & clusters
• Move cluster struct inside mod
• Support non-sequential field arrays
• Use inlined variables in format! (Rust 1.58)
• Refactor, clean periperal.rs & util.rs
• use svd_parser::expand::Index for derive
• Generated enum names now consider name field in enumeratedValues
• Use constant case for structure names; internal rearrangements for
  case conversation traits
• Add new feature feature_group which will generate cfg attribute for
  every group name when it is on
• Sort fields by offset before process
• Updated docs for write / modify