Don't ignore case in xml validation

[abbiefarr-zz]

Fix #1581

@chanseokoh @elharo

[chanseokoh]

What about WebXmlScanner? It might be being taken care of in another PR, but it should be here too in any case.

[abbiefarr-zz]

It's changed in another PR, but I can change it here too

[chanseokoh]

LGTM.

It's changed in another PR, but I can change it here too.

Thanks. This PR should be self-contained, independent of other PRs, because for example, other PRs could be abandoned or rolled back. It's also necessary to maintain correct commit history.

[codecov-io]

Codecov Report

Merging #1590 into master will increase coverage by 0.23%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1590      +/-   ##
============================================
+ Coverage     71.04%   71.27%   +0.23%     
- Complexity     1334     1355      +21     
============================================
  Files           236      236              
  Lines          9068     9170     +102     
  Branches        779      802      +23     
============================================
+ Hits           6442     6536      +94     
- Misses         2300     2305       +5     
- Partials        326      329       +3

Impacted Files	Coverage Δ	Complexity Δ
...ls/eclipse/appengine/validation/PomXmlScanner.java	100% <100%> (ø)	23 <17> (ø)	❌
...ls/eclipse/appengine/validation/WebXmlScanner.java	90% <100%> (ø)	5 <4> (ø)	❌
.../tools/eclipse/test/util/project/ProjectUtils.java	89.58% <0%> (-0.04%)	37% <0%> (+11%)
...ngine/newproject/flex/AppEngineFlexWizardPage.java	0% <0%> (ø)	0% <0%> (ø)	❌
...wproject/standard/AppEngineStandardWizardPage.java	100% <0%> (ø)	3% <0%> (ø)	❌
...ipse/appengine/newproject/AppEngineWizardPage.java	87.12% <0%> (+1.19%)	19% <0%> (+7%)	✅
...clipse/appengine/facets/NonSystemJobSuspender.java	89.18% <0%> (+5.4%)	10% <0%> (+1%)	✅
...d/tools/eclipse/appengine/libraries/BuildPath.java	84.21% <0%> (+7.84%)	9% <0%> (+2%)	✅

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[elharo]

For a bug like this, we want a test that fails before the PR and passes after.