fix(web): Update spacebar caption when refreshing layout

Merge pull request #7370 from keymanapp/fix/developer/7090-7091-use-path-backslash-format-for-parameters

fix(developer): ensure backslash in paths passed to kmcomp

fix(developer): generate valid js when using unquoted digits in stores

Fixes #7005.

If a developer used single digit values in stores, unquoted (which is
not really the usual approach, but should work just fine for non-zero
values), the KMW compiler would emit invalid single-digit hexadecimal
escapes for them, e.g. `"\x1"` instead of `"\x01"`.

Sample code:

```
store(option) 1

if(option = 1) + 'a' > 'one'
if(option = 2) + 'a' > 'two'
+ '1' > set(option = 1)
+ '2' > set(option = 2)
```

It is not immediately obvious from this code, but the value `1` is
actually a character with value `'\x01'` or `U+0001`!

The more usual approach will not encounter this problem:

```
store(option) '1'

if(option = '1') + 'a' > 'one'
if(option = '2') + 'a' > 'two'
+ '1' > set(option = '1')
+ '2' > set(option = '2')
```

Note that the following is a compile error (due to internal use of
null terminated strings).

```
store(option) 0
```

Fixes #7090.
Fixes #7091.

While kmcomp loads most files just fine when paths with forward slashes
are passed in, it fails to parse target path correctly when building one
file out of a project.

For example, if the user runs:

```
kmcomp.exe -t khmer_angkor.kmn release/k/khmer_angkor/khmer_angkor.kpj
```

Then the following error arises:

```
khmer_angkor.kps: Error: 0001 Validation error: The system cannot find the path specified.
khmer_angkor.kps: Failure: Package C:\Projects\keyman\keyboards\source\khmer_angkor.kps had validation errors.
```

This patch ensures all paths passed in as command-line parameters are
converted to backslashes, matching the expected Windows format. While I
only needed to fix the `FParamTarget` parameter in order to address the
reported issues, for consistency I applied the same fix to all input
paths.

auto: increment master version to 16.0.71

chore(common): Add 15.0 stable entries to HISTORY.md 🍒 

fix(android): Add language name when installing default lexical-model

auto: increment master version to 16.0.70

chore(common): builder extra params support 🏗 🍒

feat(common): builder trap-functionality testing 🏗️

refactor(common): `builder` script tweaks - "has action" vs "start action" 🏗️

refactor(common/web): reworks low-level module build scripts 🏗️

fix(android/engine): Check listview for setting keyboard selection

chore(common): Merge branch 'refactor/common/builder_has_vs_start' into feat/common/builder-feature-tests

chore(common): Merge branch 'refactor/web/low-level-build-scripts' into refactor/common/builder_has_vs_start

chore(common): Merge branch 'refactor/web/low-level-build-scripts' into feat/common/builder-feature-tests

* `builder_has_action` renamed to `builder_start_action`
* `builder_report` renamed to `builder_finish_action`
* `builder_has_action` created to be a silent test for the action
* Added reasonably comprehensive documentation.

auto: increment master version to 16.0.69