clar: support hierarchical test resource data
clar: support hierarchical test resource data

Support hierarchical test resource data, such that you can have
`tests/resources/foo/bar` and move the `bar` directory in as
a fixture.

Calling `cl_fixture_sandbox` on a path that is not directly beneath
the test resources directory succeeds, placing that directory into
the test fixture.  (For example, `cl_fixture_sandbox("foo/bar")`
will sandbox the `foo/bar` directory as `bar`).

Add support for cleaning up directories created this way, by only
cleaning up the basename (in this example, `bar`) from the fixture
directory.

Corillian/libgit2,sim0629/libgit2,MrHacky/libgit2,linquize/libgit2,KTXSoftware/libgit2,mingyaaaa/libgit2,kenprice/libgit2,skabel/manguse,since2014/libgit2,kenprice/libgit2,Corillian/libgit2,skabel/manguse,mrksrm/Mingijura,linquize/libgit2,saurabhsuniljain/libgit2,jeffhostetler/public_libgit2,since2014/libgit2,skabel/manguse,ardumont/libgit2,mingyaaaa/libgit2,Tousiph/Demo1,yongthecoder/libgit2,saurabhsuniljain/libgit2,since2014/libgit2,nokiddin/libgit2,leoyanggit/libgit2,claudelee/libgit2,dleehr/libgit2,MrHacky/libgit2,jeffhostetler/public_libgit2,Corillian/libgit2,magnus98/TEST,stewid/libgit2,yongthecoder/libgit2,KTXSoftware/libgit2,Tousiph/Demo1,sim0629/libgit2,mhp/libgit2,jeffhostetler/public_libgit2,dleehr/libgit2,dleehr/libgit2,t0xicCode/libgit2,spraints/libgit2,oaastest/libgit2,yosefhackmon/libgit2,joshtriplett/libgit2,sim0629/libgit2,spraints/libgit2,ardumont/libgit2,ardumont/libgit2,falqas/libgit2,JIghtuse/libgit2,mcanthony/libgit2,falqas/libgit2,yosefhackmon/libgit2,stewid/libgit2,iankronquist/libgit2,oaastest/libgit2,falqas/libgit2,jeffhostetler/public_libgit2,stewid/libgit2,linquize/libgit2,jeffhostetler/public_libgit2,sygool/libgit2,claudelee/libgit2,spraints/libgit2,MrHacky/libgit2,yosefhackmon/libgit2,mingyaaaa/libgit2,kissthink/libgit2,mrksrm/Mingijura,Tousiph/Demo1,stewid/libgit2,kenprice/libgit2,linquize/libgit2,kenprice/libgit2,linquize/libgit2,mrksrm/Mingijura,sygool/libgit2,ardumont/libgit2,mhp/libgit2,kenprice/libgit2,leoyanggit/libgit2,skabel/manguse,mcanthony/libgit2,claudelee/libgit2,oaastest/libgit2,magnus98/TEST,mingyaaaa/libgit2,falqas/libgit2,dleehr/libgit2,Corillian/libgit2,Tousiph/Demo1,joshtriplett/libgit2,kissthink/libgit2,JIghtuse/libgit2,yongthecoder/libgit2,joshtriplett/libgit2,sygool/libgit2,mhp/libgit2,iankronquist/libgit2,t0xicCode/libgit2,spraints/libgit2,sim0629/libgit2,claudelee/libgit2,yosefhackmon/libgit2,MrHacky/libgit2,nokiddin/libgit2,kissthink/libgit2,leoyanggit/libgit2,dleehr/libgit2,t0xicCode/libgit2,magnus98/TEST,since2014/libgit2,mrksrm/Mingijura,stewid/libgit2,claudelee/libgit2,oaastest/libgit2,yongthecoder/libgit2,mhp/libgit2,KTXSoftware/libgit2,Tousiph/Demo1,magnus98/TEST,mcanthony/libgit2,joshtriplett/libgit2,kissthink/libgit2,yongthecoder/libgit2,since2014/libgit2,yongthecoder/libgit2,linquize/libgit2,nokiddin/libgit2,nokiddin/libgit2,JIghtuse/libgit2,MrHacky/libgit2,mingyaaaa/libgit2,spraints/libgit2,Corillian/libgit2,t0xicCode/libgit2,oaastest/libgit2,mrksrm/Mingijura,mrksrm/Mingijura,KTXSoftware/libgit2,joshtriplett/libgit2,sygool/libgit2,JIghtuse/libgit2,magnus98/TEST,mhp/libgit2,skabel/manguse,kissthink/libgit2,saurabhsuniljain/libgit2,sygool/libgit2,nokiddin/libgit2,magnus98/TEST,claudelee/libgit2,iankronquist/libgit2,ardumont/libgit2,mcanthony/libgit2,sygool/libgit2,KTXSoftware/libgit2,Corillian/libgit2,JIghtuse/libgit2,oaastest/libgit2,kenprice/libgit2,JIghtuse/libgit2,t0xicCode/libgit2,jeffhostetler/public_libgit2,ardumont/libgit2,mhp/libgit2,dleehr/libgit2,Tousiph/Demo1,iankronquist/libgit2,saurabhsuniljain/libgit2,sim0629/libgit2,iankronquist/libgit2,kissthink/libgit2,skabel/manguse,nokiddin/libgit2,stewid/libgit2,saurabhsuniljain/libgit2,leoyanggit/libgit2,mcanthony/libgit2,falqas/libgit2,KTXSoftware/libgit2,leoyanggit/libgit2,mingyaaaa/libgit2,MrHacky/libgit2,mcanthony/libgit2,falqas/libgit2,iankronquist/libgit2,joshtriplett/libgit2,saurabhsuniljain/libgit2,spraints/libgit2,since2014/libgit2,leoyanggit/libgit2,t0xicCode/libgit2,sim0629/libgit2,yosefhackmon/libgit2,yosefhackmon/libgit2