[LyX/master] Add three new files from Andrew Parsloe. These do for AMS-type theorem environments what the already existing "by chapter" modules do for non-AMS ones.

[Richard Kimberly Heck]

On 5/29/20 11:12 AM, Kornel Benko wrote:
> Am Fri, 29 May 2020 10:33:23 -0400
> schrieb Scott Kostyshak <skostysh at lyx.org>:
>
>> On Thu, Nov 17, 2016 at 05:39:54PM +0100, Richard Heck wrote:
>>> commit 0f5ba65eae1b3e069be0be279904c911fe02907c
>>> Author: Richard Heck <rgheck at lyx.org>
>>> Date:   Thu Nov 17 10:59:49 2016 -0500
>>>
>>>     Add three new files from Andrew Parsloe. These do for AMS-type
>>>     theorem environments what the already existing "by chapter" modules
>>>     do for non-AMS ones.
>>> ---  
>> I'm looking into some fixes to the theorem style and noticed that there
>> is a lot of duplication. Is there a reason for this? I'm not very
>> familiar with our layout mechanism, but why don't we centralize the
>> common definitions and, if needed, use ModifyStyle?
>>
>> Scott
> But we do it already, each *.inc file is an attempt in this direction.
> Not successful enough though :)

I'm not sure when ModifyStyle came into existence, actually. Could be that,

Riki