Parashara Shamaprasad

Dihedral rotator function

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### PR Summary: Adds a function that allows you to rotate a proper dihedral angle in a compound about a specified central bond. This can be useful for setting up...

RecursionError when using multiprocessing pool with an mBuild compound

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**Bug summary** I get a pickling recursion error when trying to use multiprocessing in a script with an mBuild compound. Is this a bug in mBuild? Is there a better...

Clarify default args for box in Compound.save()

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**Bug summary** Docstring says that the box arg defaults to `self.boundingbox`, but defaults to periodicity IRL. We should either use the bounding box or track the periodicity better when adding...

**Describe the behavior you would like added to mBuild** It seems that the coordinate transforms module can be made a little faster by using vectorization and eliminating unnecessary calculations. This...

The mBuild function [`pattern.apply()`](https://github.com/mosdef-hub/mbuild/blob/d6ad4db014077a3900f95e1c4fdf91c6caa43c68/mbuild/pattern.py#L68) is not currently being tested in the unit tests. We should add a test function for this. See #625

Add initial attempt at a plugin detector.

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Here is an attempt at a writing a plugin detector (fixes #290). See `foyer.plugins:collect_plugins()` Functions named `foyer.forcefields.load_{plugin_name}` are detected as plugins, but there is also a `plugin_names` argument to supply...

**Describe the behavior you would like added to Foyer** A plugin detector within foyer that will detect all of the `foyer` plugins installed in the environment. We would also want...

Joining multiple topologies together

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Is there a way to join several topologies to make one big topology? An example use case would be if you have one molecule typed with a particular force field...

Do we want the connection type type dictionary in Forcefield to have member types as keys

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https://github.com/mosdef-hub/gmso/blob/5781bf8a4917e83cac541a0c5d9343a4d2cbc1f5/gmso/utils/ff_utils.py#L239 Currently connection types can be referenced from the forcefield using a string of the member types as the keys, like so `forcefield.angle_types["opls_116~opls_117~opls_117"]`. This makes it impossible to layer multiple...

Standardize file readers and writers

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There should be a standard format for file readers and writers so that they can be consistent and extensible. Standardization could be enforced by defining an abstract class that each...