static imports suggested by dmd 2.071

[SimonN]

dmd 2.071 has cleaned up module importing. Building toml-d with dmd 2.071 produces many deprecations of this form:

toml-d-0.3.0/source/toml/grammar.d-mixin-85(495,34): Deprecation: module pegged.peg is not accessible here, perhaps add 'static import pegged.peg;'

This is cosmetic. toml-d works still.

[jaydg]

pegged 0.3.2 was release to resolve these warning; updating to this release mutes most of them.
Four other warnings were fixed by adding a missing import.