…#730)
* * <frameworks>, <weakFrameworks>, <xcFrameworks> -- qualified with constraints
As discussed over gitter -- it becomes complicated to maintain build targeted for thumbv7 (32bit) version of ios when xcframework doesn't contain this slice.
For example Firebase dropped 32 bit support and ios11+ only.
This requires flexibility to be able to include frameworks only for specific architectures.
Implementation is same as for `frameworkPaths` -- <frameworks>, <weakFrameworks>, <xcFrameworks> were extended with `arch` tag that limit the scope, for example:
```
<config>
   <frameworks>
      <framework arch="arm64">arm64_only_framework</framework>
   </frameworks>
</config>
```
* * fixed test: should build config with skip signing otherwise it will fail on attempt to find provisioning profile
* * fixed: strict rules for elements in lists inside `robovm.xml`
## Root case:
SimpleXML issue: it allows unexpected tags to be present while parsing list, this caused side effect like empty text tags or null objects inserted into the list, for example
```
   <frameworks>
      <wrong><framework>aaaa</framework><wrong/>
   </>
```
would result in (null, "aaaa") in list (beside the fact that structure is wrong)
## The fix
General approach for a workaround is change List field type to custom POJO and make its serialization strict:
E.g. instead of
```
 @ElementList(required = false, entry = "framework")
 private ArrayList<String> frameworks;
```
list wrapper class to be used:
```
 @element(required = false)
 private FrameworksList frameworks;
```
list wrapper class expected to be @root with strict = true, so unexpected tags will cause exception
(cherry picked from commit fb27d44)