Add BC shim for template lookup in former directories.

[dereuromark]

Follow https://github.com/propelorm/Propel2/pull/1848

Just to make sure we ease the upgrade issues here for folks that use behaviors or other custom repositories with extension and templates.

[codecov-commenter]

Codecov Report

Merging #1855 (86da93a) into master (d4c4392) will decrease coverage by 0.03%. The diff coverage is 25.00%.

@@             Coverage Diff              @@
##             master    #1855      +/-   ##
============================================
- Coverage     87.84%   87.81%   -0.04%     
- Complexity     7766     7769       +3     
============================================
  Files           226      226              
  Lines         21043    21053      +10     
============================================
+ Hits          18486    18488       +2     
- Misses         2557     2565       +8     

Flag	Coverage Δ
5-max	87.81% <25.00%> (-0.04%)	:arrow_down:
7.4	87.81% <25.00%> (-0.04%)	:arrow_down:
agnostic	67.09% <25.00%> (-0.03%)	:arrow_down:
mysql	69.08% <25.00%> (-0.03%)	:arrow_down:
pgsql	69.10% <25.00%> (-0.03%)	:arrow_down:
sqlite	66.92% <25.00%> (-0.03%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Propel/Common/Util/PathTrait.php	67.85% <25.00%> (-26.59%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update d4c4392...86da93a. Read the comment docs.

[dereuromark]

Could someone dev-qa and approve this please? @mringler @oojacoboo etc

[oojacoboo]

Logic seems okay, but I don't fully know what input and output to expect here, so it's hard to give it much scrutiny.

[dereuromark]

You can see the linked pr for previous template paths