* Freeze DAML-LF 1.dev into DAML-LF 1.5
In other words, we release DAML-LF 1.5.
This is required for generic templates (#1387).
* description of FROM_TEXT_INT64 & FROM_TEXT_DECIMAL
* amend version history
add ``FROM_TEXT_INT64`` and ``FROM_TEXT_DECIMAL`` in the specification changelog
* typos
* Fix markup in DAML-LF spec
* Add release notes
* Drop support for DAML-LF 1.1 from damlc
Part of #853.
* Fix docs test
* Add show party test back
* Update release notes
* Remove target version from Java codegen test
* clean up v3 contract key case in TransactionVersions
* clean up duplicate cases in ValueVersions.assignVersion
* make LanguageMinorVersion a proper ADT, aliased LanguageVersion.Minor
* port DecodeV1 to LanguageMinorVersion ADT via implicit conversion
- @remyhaemmerle-da might prefer the explicit application of Stable/Dev
* make releasePrecedes private
* add dev versions to the timeline
* copyright header for LanguageMinorVersion
* build the package database for 1.dev, support 1.dev as --target
* test presence and new-ness of "dev" in timeline
* report dev versions in engine info; note 1.dev target in release notes
* spec and governance rules on 1.dev and minor dev in general
* make the governance rule about dev more direct
* 1.x
* missed plural; thanks @leo-da
* further definition of 1.dev in LFv1 spec; thanks @remyhaemmerle-da
