See comment in PR https://github.com/alire-project/alire-index/pull/1804 for LEA:
"Using [gpr-set-externals] here will make the build modes impossible to override by users. Use a default in the GPR file by using External (<VAR>, <default>)."
* Create texcad-4.5.2.toml
First presence of TeXCAD on Alire!
* Update texcad-4.5.2.toml
Correct license naming.
* Update texcad-4.5.2.toml
Enriched the tag list.
Force `PRJ_BUILD` to `Release` to avoid `-gnatwe` and compilation issue:
```
templates_parser.adb:2093:55: warning: pragma Unreferenced given for "Next_Last" [enabled by default]
```
Also applied the rest of transformations described in alire#227: no top-level
[genera] table, name/version keys, [[depends-on]] array instead of table.
Crates without maintainer or pending migration remain in /orphaned
GitHub URLs rely on the default tarballs that at some point will
have to be released with uploaded binaries (with `alr publish` support).