Beef up app_props.in and tidy app.cpp

testing/resources/javascript/app_props_expected.txt

-Alert: app.viewerType property value: pdfium
+Alert: *** Getting properties ***
+Alert: app.activeDocs is object [object Object]
+Alert: app.calculate is boolean true
+Alert: app.formsVersion is number 7
+Alert: ERROR: app.fs: 
+Alert: ERROR: app.fullscreen: 
+Alert: app.language is string ENU
+Alert: ERROR: app.media: 
+Alert: app.platform is string WIN
+Alert: app.runtimeHighlight is boolean false
+Alert: app.viewerType is string pdfium
+Alert: app.viewerVariation is string Full
+Alert: app.viewerVersion is number 8
+Alert: *** Setting properties ***
+Alert: ERROR: app.activeDocs: 
+Alert: app.calculate = 3; yields 3
+Alert: ERROR: app.formsVersion: 
+Alert: ERROR: app.fs: 
+Alert: ERROR: app.fullscreen: 
+Alert: ERROR: app.language: 
+Alert: ERROR: app.media: 
+Alert: ERROR: app.platform: 
+Alert: app.runtimeHighlight = 3; yields 3
+Alert: ERROR: app.viewerType: 
+Alert: ERROR: app.viewerVariation: 
+Alert: ERROR: app.viewerVersion: 
+Alert: *** Getting properties ***
+Alert: app.activeDocs is object [object Object]
+Alert: app.calculate is boolean true
+Alert: app.formsVersion is number 7
+Alert: ERROR: app.fs: 
+Alert: ERROR: app.fullscreen: 
+Alert: app.language is string ENU
+Alert: ERROR: app.media: 
+Alert: app.platform is string WIN

[Lei Zhang, 2015/09/08 23:21:36]

I didn't check the values against the Acrobat PDF JS doc, so some of these may
not correct. This one seems wrong for sure when we're not on Windows. We can fix
them as we go.

+Alert: app.runtimeHighlight is boolean true
+Alert: app.viewerType is string pdfium
+Alert: app.viewerVariation is string Full
+Alert: app.viewerVersion is number 8