Rez

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.52.1) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.52.0...2.52.1)

**Merged pull requests:**

- added new env vars - REZ_SHELL_INIT_TIMESTAMP, REZ_SHELL_INTERACTIVE [\834](https://github.com/AcademySoftwareFoundation/rez/pull/834) ([nerdvegas](https://github.com/nerdvegas))

**Closed issues:**

- add env-var to record shell init time [\833](https://github.com/AcademySoftwareFoundation/rez/issues/833)

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.52.0) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.51.0...2.52.0)

**Notes**

Adds a new [pre_build_commands](https://github.com/AcademySoftwareFoundation/rez/wiki/Package-Commands#pre-build-commands)
package.py attribute, for adding runtime build configuration.

**Merged pull requests:**

- Rep002 pre build commands [\825](https://github.com/AcademySoftwareFoundation/rez/pull/825) ([nerdvegas](https://github.com/nerdvegas))

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.51.0) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.50.0...2.51.0)

**Notes**

This release goes a large way to implementing [REP-001](https://github.com/AcademySoftwareFoundation/rez/issues/665)

Includes:
- Pre-install/release running of package tests;
- New rez-test `--inplace` option;
- Correct iteration of tests over variants (variant iteration did not previously exist)

Still to do:
- rez-test `--interactive` option;
- rez-test 'development' mode.

**Merged pull requests:**

- Rep001 1 (rez-test improvements) [\807](https://github.com/AcademySoftwareFoundation/rez/pull/807) ([nerdvegas](https://github.com/nerdvegas))
- Rep001 2 hooks [\811](https://github.com/AcademySoftwareFoundation/rez/pull/811) ([nerdvegas](https://github.com/nerdvegas))

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.50.0) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.49.0...2.50.0)

**Merged pull requests:**

- removed odd case of _Bound instantiation with Version [\815](https://github.com/AcademySoftwareFoundation/rez/pull/815) ([nerdvegas](https://github.com/nerdvegas))
- memcached incompatibility fix [\818](https://github.com/AcademySoftwareFoundation/rez/pull/818) ([nerdvegas](https://github.com/nerdvegas))
- Bug/819 enable colorization on windows [\820](https://github.com/AcademySoftwareFoundation/rez/pull/820) ([instinct-vfx](https://github.com/instinct-vfx))

**Closed issues:**

- potential memcached client incompatibility [\817](https://github.com/AcademySoftwareFoundation/rez/issues/817)
- Remove hard prevention of colorization on windows [\819](https://github.com/AcademySoftwareFoundation/rez/issues/819)

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.49.0) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.48.1...2.49.0)

**Merged pull requests:**

- Migrate rezgui.qt imports to Qt.py [\804](https://github.com/AcademySoftwareFoundation/rez/pull/804) ([douglaslassance](https://github.com/douglaslassance))

[Source](https://github.com/AcademySoftwareFoundation/rez/tree/2.48.1) | [Diff](https://github.com/AcademySoftwareFoundation/rez/compare/2.48.0...2.48.1)

**Merged pull requests:**

- Fixes 792 cmd empty echo [\793](https://github.com/AcademySoftwareFoundation/rez/pull/793) ([bfloch](https://github.com/bfloch))

**Closed issues:**

- cmd handles empty echo incorrectly [\792](https://github.com/AcademySoftwareFoundation/rez/issues/792)