Replace the bash selftest plumbing with CTest.
To use the selftests, build with -DLWS_WITH_MINIMAL_EXAMPLES=1
and `CTEST_OUTPUT_ON_FAILURE=1 make test` or just
`make test`.
To disable tests that require internet access, also give
-DLWS_CTEST_INTERNET_AVAILABLE=0
Remove travis and appveyor scripts on master.
Remove travis and appveyor decals on README.md.
Add support for blob type in sqlite3... it's unusual in that it
is created into the table schema as a column of blob type, but is
not serialized or deserialized into or from JSON or sqlite.
Because the size of blobs is open-ended, accessing them in one
hit may not be possible, eg, exceed the size of available heap.
As binary, they would have to be base64-encoded in JSON
representation and that bloating may be excessive, with, eg,
a 500MB blob. So while they can be defined using lws_struct
schema, and coexist inside a column of a table managed by
lws_struct, they must be read and written separately.
Continue with lws_struct, add sqlite support for one
level of lws_dll2_t lists of structs serialization and
deserialization, plus the matching api-test.
