* Clean package caches (saves about 1GB of layer-space)

* Update installation instructions

* Update layout
* Use template variables where appropriate
* Instructions now provide release notes in one place

* Pandoc now uses --standalone

* The packages directory is copied to the build/docker directory.
* There is no need to separate these ADD calls.

* Destination directories were not created properly
* This ensures $HOME/packages/{conda,wheels} are created in the docker developer home directory

* Continuation of #19

* Fixes always_update_base_environment override bug added by PR #19

* Finish type hinting implementation

* ini_getval_* functions now able to affect rendering mode using INI_READ_RAW and INI_READ_RENDER
* Created pointers to deeply nested structures to increase readability
* Output from ini_write() is more consistent, with fewer errant spaces and line feeds
* Fixes accidental regression in #19. INIVAL_TYPE_STR_ARRAY never produced an array of pointers to char. This needs to be corrected in the future. i.e. It has always generated a new-line delimited string, not a StrList, or array.

* Fix strlist_append_tokenize

* original pointer is no longer modified
* token strings are stripped of leading space before appending to the list

* Use defines instead of magic numbers

* delivery_init: add render_mode argument

* test_conda: Add render mode

* test_ini: Add render mode

* Only add conda packages and wheels to the image

* docker images are saved to the packages directory and will be consumed by the image if present.

* Render template variables after bootstrapping the delivery

* LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line XY)

* Move ADD calls to improve docker build's caching behavior
* Replace template strings with package paths
* Give the "developer" user access to the generated spec file on-disk

* CONDA_VERSION and CONDA_BUILD_VERSION are never used in a meaningful way

* Generate Dockerfile