fix: Support mixed content for DTD elements

[tefra]

📒 Description

Resolves #739

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[codecov]

Codecov Report

Base: 100.00% // Head: 99.98% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (cdc9762) compared to base (8d431a2).
Patch coverage: 91.66% of modified lines in pull request are covered.

❗ Current head cdc9762 differs from pull request most recent head 03fd4dd. Consider uploading reports for the commit 03fd4dd to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #749      +/-   ##
===========================================
- Coverage   100.00%   99.98%   -0.02%     
===========================================
  Files          101      101              
  Lines         8804     8814      +10     
  Branches      1953     1955       +2     
===========================================
+ Hits          8804     8813       +9     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
xsdata/codegen/mappers/dtd.py	99.26% <91.66%> (-0.74%)	⬇️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication