Move the code for collecting package information to a separate method.

Reorder code so that local functions come before the high-level algorithm.

Consolidate package related information in getPackageConfigs into a single struct.

Remove unused function.

Refactor removeConfig with filterInPlace.

Add filterInPlace utility function. ...

Note: this function should probably be added to Phobos eventually.

Fix parameter naming convention.

Merge pull request #2905 from dlang/speed_up_config_resolution ...

Speed up configuration resolution

update version to v1.38.0-beta.1

Avoid visiting packages more than once in checkPacksRec.

Avoid linear time edge list construction. ...

Uses a set to determine redundant edge entries instead of iterating through the list.

Reduce allocation overhead in determineDependencyConfigs.

Avoid linear lookup and name allocations in Project.getDependency.

Avoid linear time haveConfig.

Use package indices instead of names or Package instances to identify packages. ...

Avoids costly AA lookups and string comparisons.

Avoid re-allocating allconfigs_path in determineAllConfigs.

Avoid re-allocating the AA for isReachableByAllParentPacks for every call.

Eliminate edges in the configuration graph in-place. ...

Avoids reallocating the edges array every time the configuration resolution eliminates a configuration.

Cache various package information to reduce GC allocations in getPackageConfigs. ...

Package.name and Package.getAllDependencies both need to reallocate their return value for every call, which results in heavy GC pressure during the configuration resolution algorithm.

Respect skipRegistry value from configuration files ...

Currently, the skipRegistry value in configuration files is ignored,
the final value is either the one the user passed on the command line,
which is the intended behavior, or the value `none` if the user didn't
pass a --skip-registry argument.

This commit fixes this by introducing the new value `default_` to the
SkippackageSuppliers enum to know when the user didn't pass the
skip-registry argument and the value should be taken from the
configuration files.

Signed-off-by: Andrei Horodniceanu <a.horodniceanu@proton.me>

Merge pull request #2897 from atilaneves/parse-module ...

Speed up module parsing with hand-written parser

Improve the output when the subcommand is not found ...

Sort subcommands based on similarity.

Prune the result of `Package.getAllDependenciesRange`

Return early from determineDependencyConfigs if possible ...

The only package that can have a config already created is the root
package, and only if the `config` parameter isn't an empty string.
Every other package is in the `configs` array iff it was added by
a previous call to this function. The exact same configurations
will be found if this function is called again for the same (p, c)
pair and it will do needless work that won't modify anything.

Fix bug

Remove abandoned registry mirrors. ...

Both of these have not been working for a long time now.

Handle non-ASCII characters

Handle /++ ++/

Handle underscores

Speed up module parsing with hand-written parser