feat(core): tolerate missing dependencies — warn instead of crash

[mcpolo99]

Fixes #4
Upstream: mkaring#155

Problem

ConfuserEx crashes during the Inspection phase if ANY assembly dependency cannot be resolved, even if that dependency isn't needed for the protections being applied.

Fix

Inspection phase (ConfuserEngine.cs)

• Replace ResolveThrow with Resolve (non-throwing)
• Log a warning for unresolved dependencies instead of crashing
• Obfuscation continues with best-effort results

DnlibUtils.cs — null-safe type resolution

• InheritsFromCorlib: use ResolveTypeDef() with null check instead of ResolveTypeDefThrow()
• InheritsFrom: same pattern
• Implements: same pattern, removed unreachable throw
• IsImplicitImplementedInterfaceMember: same pattern

These are the core changes from upstream PR mkaring#155 (which touched 215 files). The rest of that PR was project restructuring and test deletions — not applicable to our fork.

Impact

Assemblies with missing third-party dependencies can now be obfuscated. Protections that need the missing types will skip them gracefully (via our earlier fixes in PRs #42, #43, #45).