fix: panics on named types, unbounded exponent, ignored "-" tag

[wrfly]

Panics

Parsing built the value with a hard-coded concrete type and assigned it to the field, which panics as soon as the field is not exactly that type:

type Level int
type Conf struct{ L []Level }         // reflect.Set: []int is not assignable to []Level
type Conf struct{ D *time.Duration }  // reflect.Set: *int64 is not assignable to *time.Duration

Both are reachable from an ordinary env value, and *time.Duration is a natural way to express "unset vs zero".

Both paths now build the value through the field's own reflect.Type, so named types work like their underlying kind. That single setValue helper replaces the fifteen near-identical branches of parseSlice and all of parsePointer (parse.go: 291 → 78 lines), and *time.Duration gains the "10s" syntax time.Duration already had.

Other fixes

	before	after
PORT=1e1000000	~100s building a 1MB string	rejected immediately
1.5e3	unparsable "1.5000"	1500
yaml:"-" / json:"-" / env:"-"	honoured by List, ignored by Parse (default applied, field bound to a key named -)	skipped by both
Parse(config) without &	nil error, nothing filled	error
*SubStruct section	never walked into, bogus flat key in List	optional section, allocated only when something is set, cycle-guarded
default:"false" on a bool	overwrote a caller-set true	kept, like every other kind
map / array fields	silently ignored	reported, and no longer listed
"a b" (default separator)	3 elements, numeric slices fail	2 elements
List quoting	A="a "b" c"	strconv.Quote
Get	no prefix, pointer-only config, missed named types	prefix param, works read-only, kind-based
parse errors	%s	%w
parser type	unexported *ecp	exported *ECP

Tests

TestGetKeyLookupValue replaced globalEcp.LookupValue and only restored BuildKey, leaking the mock into every test that ran after it — new tests were silently reading from it instead of the environment.

Regression coverage added for every item above; coverage 91.5% → 94.2%, suite passes under -race -shuffle=on -count=2.

Chores

CI runs vet, -race and gofmt over a Go 1.19/1.21/1.23/stable matrix (actions/*@v4/v5). Dead Travis config and badge removed. The README example printed output it did not actually produce (new log level: [ info ] was really debug, LOGLEVEL=debug was really ECP_LOGLEVEL=debug) — it is corrected and verified by running it.

Compatibility

Behaviour changes on purpose, hence a minor bump: Parse without a pointer now errors, --tagged fields are no longer filled, a caller-set bool survives default:"false", and unsupported kinds error instead of being ignored. The exported-type and Get prefix changes are source-compatible.

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