sdbus++: events: create json for events

Create JSON for the events containing their metadata and leverage that
as the "message" portion of the `sd_bus_error`. This will allow
unpacking the message

sdbus++: events: create json for events

Create JSON for the events containing their metadata and leverage that
as the "message" portion of the `sd_bus_error`. This will allow
unpacking the message on a client side back to the original exception.

Tested:
```
$ busctl --user call net.poettering.Calculator /net/poettering/calculator net.poettering.Calculator Divide xx 5 0
Call failed: {"net.poettering.Calculator.DivisionByZero":{"FOO":"unused"}}
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I4edd76d983267f28e51c4aa41902d45f5d6da793

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build: Allow for vendored googletest

This makes it easier to run the test suite outside of the CI
environment but still attempts to use the system version of googletest
first.

Change-Id: I32193f082

build: Allow for vendored googletest

This makes it easier to run the test suite outside of the CI
environment but still attempts to use the system version of googletest
first.

Change-Id: I32193f08243db2177b8200b0ff7e3e47ef01691f
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

show more ...