Refactor ini getter and setter usage (#19)

* Add handler for space-delimited lists

* This needs attention, however. The INI writer has no way to know a list with spaces is a list; this happens in the value conversion functions.
* Add type_hint member to INIData structure. At some point support with be added for all INIVAL_TYPE_* defines. Right now it's only used with arrays.
* Zero out line buffer in ini_open after each iteration
* Do not strip raw INI data. Let the conversion functions handle it
* Add spaces to key value pairs in rendered INI output.

* Add ini_getvar_TYPE() functions

* These replace the functionality of static conv_TYPE() functions in delivery.c
* Add support for missing types: U/CHAR, U/SHORT, STRLIST

* ini_getval: expand template variables immediately before processing the output

* Strip leading space to avoid issues with string comparisons against the result

* ini_getval: Return copies, not the original.

* This forces one to use ini_setval to replace/append values to the data array(s). It's safer this way.

* fix_tox_conf(): Use ini_getval and ini_setval instead of modifying the original pointers directly

* Tests: Free resources

* Replace ini_getval(), ini_getval_required() and conv_*() usage

* Now using ini_getval_TYPE() functions and ini_setval()
* Remove unused helper functions and variables

* download() returns long, not int

* actions: update apt cache

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