add raw CSV export

This allows exporting the raw data of a schema in the same format as
used in the CSV import.

first go at CSV import #239

This adds CSV importing for Lookup Schemas. The format is fixed (comma
separator, " encapsulation, \ escape). The first row has to contain
headers matching the Schema's f

first go at CSV import #239

This adds CSV importing for Lookup Schemas. The format is fixed (comma
separator, " encapsulation, \ escape). The first row has to contain
headers matching the Schema's field names. Non matched fields are
ignored.

No validation is done on import. All data is stored as is and will then
bw interpreted by the different types.

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do not invalidate ALL caches when a schema is updated. #216

Instead we keep a separate reference file to be updated when schemas are
changed. A cache handler adds this file to all pages having schem

do not invalidate ALL caches when a schema is updated. #216

Instead we keep a separate reference file to be updated when schemas are
changed. A cache handler adds this file to all pages having schema
assignments.

Saving a schema feels noticably faster now (because JS and CSS no longer
are invalidated).

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better handling of failing sqlite plugin init. fixes #200

made Assignments singleton. fixes #163

fix importing into a new lookup schema

make sure lookups aren't assigned to pages

This prevents pattern assignment and will ignore any lookups when
reading the assignments for a given page.

Should probably have some tests

lookup schemas can now be created

added lookup selection in schema creation dialog

Confirm before deleting assignment

SPR-538

Use last file in config cascade

This last file is the one actually used to determine whether the cache
is still valid. DOKU_CONF . 'local.php' is not necessarily part of that
cascade

Invalidate the cache when a schema changes

So Schema changes are visibly immediately.

SPR-347

Use DokuWiki new autoloader for class files

No longer do we need to register our own autoloader. Namespace had to be
vendor prefixed.

Added way to delete a schema and all its data

added Schema Import #32

This also adds a nice interface for that to the schema editor

allow exposting struct schemas as JSON #32

allow regexps for page assignments. #70

moved schema listing to central place

make admin interface available to managers. closes #31

fixed assignment listing

renamed a few methods to be more clear

now that we have assignments and patterns we have to differentiate
correctly

fixed a bunch of minor things found by IntelliJ Idea

added localization in schema assignment

fixed wrong error message in schema assignment

some localization