Voila-materialscloud-template

**Changes**:
- Update `voila` support to v0.2.7 (36, 39)

**Developer updates**:
- Update utility dependencies (35)

**Minor fix**:
- Correct spelling mistake of `viewport` width value (31).

**Changes**:
- Set minimum height for `"loading"` class, which encompasses the loading spinner (28).
This is suggested fix to solve the iframing issue of the loading spinner.
- Update loading spinner text (27, 28) amitkumardeol, CasperWA

**New features**:
- **New template**: *materialscloud-iframe* (16) CasperWA.
This is to be used specifically on MaterialsCloud when iframing the Voilà application as a Tool or otherwise.
It imitates the `tools-barebone` framework system and how one creates an application based on it.

**Changes**:
- Use MaterialsCloud spinner when loading Voilà application (18, 22) dou-du CasperWA.
- Bump `voila` version to v0.2.4 (21).
- Remove all "material" template files (19) CasperWA.
- Update standard CSS to the latest CSS used in the "lab" template from Voilà (19) CasperWA.
- Update breadcrumb to look more like what is seen from using the `tools-barebone` framework system on MaterialsCloud (19) CasperWA.

- Add the favicon logo to the template

**Bug fixes**:
- Removed erroneous reference to a unexisting element, which resulted in a lot of unnecessary console message errors (14).