mark bundled content with SPDX file

The SPDX file contains hand-written metadata about source URL, version,
authors, and license.

There are two missing pieces in HTTP module:
- bootswatch theme - I could not find what theme we ship, maybe it is
  based on one of bootswatch themes but heavily modified
- selectize.js source does not match respective files in upstream but
  contains minor changes

I will deal with these in later commits.

contrib/base32hex.spdx

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contrib/base64.spdx

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+PackageOriginator: Organization: Knot DNS contributors
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contrib/ccan/asprintf/asprintf.spdx

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contrib/ccan/compiler/compiler.spdx

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contrib/ccan/json/json.spdx

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contrib/dynarray.spdx

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+PackageOriginator: Organization: Knot DNS contributors
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contrib/murmurhash3/murmurhash3.spdx

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contrib/ucw/libucw.spdx

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contrib/wire.spdx

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lib/generic/map.spdx

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lib/generic/trie.spdx

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+PackageOriginator: Organization: Knot DNS contributors
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modules/http/static/bootstrap-theme.min.css.spdx

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+PackageLicenseDeclared: MIT

modules/http/static/bootstrap.min.js.spdx

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modules/http/static/d3.spdx

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modules/http/static/datamaps.world.min.spdx

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modules/http/static/dygraph.min.js.spdx

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modules/http/static/epoch.spdx

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modules/http/static/glyphicons-halflings-regular.spdx

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modules/http/static/jquery.spdx

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modules/http/static/topojson.spdx

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